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A Novel Process of the Bulged Tube Manufactured by Laser-Induced Shock Wave

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SSRN 2023年

作者： Zhang, Xingquan Hu, Rui Fang, Jinxiu Zuo, Lisheng Yin, Yuande Wang, Huiting Li, Shengzhi Key laboratory of green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education Anhui Ma’anshan243002 China School of Mechanical Engineering Anhui University of Technology Anhui Ma’anshan243002 China School of Mechanical Engineering Jiangsu University Zhenjiang212013 China

The novel tube forming technology was introduced, which adopts pulsed laser as a stamping tool to achieve a small-diameter bulged tube that is not available by means of the conventional forming. In this paper, the dynamic forming mechanism of laser shock tube bulging was introduced, and an analytical model was developed to analyze shock wave propagation and tube micro bulging deformation induced by a single laser irradiation. A finite element model was proposed to simulate shock wave propagation and the dynamic progress of the tube expansion. A series of validated deformation experiments were conducted. The investigations show that the laser-induced shock wave diffuses rapidly, and the tube expansion at the shocked zone takes place and the deformed tube presents a micro bulging shape after one laser shocking. The application of the confining layer is very beneficial to enlarge the bulging deformation. The magnitude of the bulged deformation is enlarged with the increase of laser shots. The higher energy of applied laser pulse always results in the larger deformation of the tube. © 2023, The Authors. All rights reserved.

关键词： Wave propagation

Vapor-Phase Polymerization of Fibrous PEDOT on Carbon Fibers Film for Fast Pseudocapacitive Energy Storage

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SSRN 2022年

作者： Zhu, Xiaoyan Han, Xiying Guo, Rui Yuan, Peng Dang, Liqin Liu, Zonghuai Lei, Zhibin Key Laboratory of Applied Surface and Colloid Chemistry MOE Shaanxi Engineering Lab for Advanced Energy Technology Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University 620 West Chang’an Street Shaanxi Xi'An710119 China

Poly(3,4-ethylenedioxythiophene) (PEDOT) has emerged as one of promising conductive polymers holding huge promise in pseudocapacitive energy storage. However, the conventional solution-based oxidative polymerization usually yields PEDOT electrodes with low electric conductivity and limited electroactive surface area. This work reports the preparation of highly conductive fibrous PEDOT by a vapor-phase polymerization initialized with Fe2O3 nanosheets that are uniformly electrochemically deposited on the N-doped carbon nanofibers (CNFs) film. The incorporation of highly conductive PEDOT nanofibers expands the film and simultaneously increase the film conductivity by 80 times (103 S cm-1). The spatially continuous and mechanically robust CNF-PEDOT film features abundant ion and electron pathways. Accordingly, an areal capacitance of 1926 mF cm-2 at PEDOT mass loading of 8.68 mg cm-2 together with a high-rate capability and high utilization efficiency of electrode have been achieved. Especially, the CNF-PEDOT film electrode exhibits an outstanding stability with 87% capacitance retention after 10000 consecutive charging and discharging cycles. Moreover, a CNF-PEDOT-based supercapacitor could deliver an energy density of 97 μWh cm-2 at power density of 0.45 mW cm-2, surpassing the state-of-the-art PEDOT-based devices. This work will open a new avenue for preparing highly conductive PEDOT hybrid electrodes towards high-performance supercapacitors. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

Transparent Organic Glass With Bright Triplet Excitons for High-Spatial-Resolution Indirect X-Ray Imaging via Heavy Metal Halide Incorporation

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advanced Optical Materials 2025年第10期13卷

作者： Xu, Ziwei Li, Nan Feng, Xiaolong Yan, Xiangyang He, Tong Zhang, Lu Liu, Shengzhong Yang, Zhou Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710062 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of the Chinese Academy of Sciences Beijing 100039 China

Organic scintillators are emerging as promising candidates for indirect X-ray imaging due to their tunable luminescent properties. However, achieving high transparency while maintaining a high content of organic luminescent material in organic scintillation pellets remains a challenge, which limits their imaging performance. In this study, a transparent luminescent organic glass based on ethyl-triphenyl-phosphonium chloride (ETPCl) is presented, which exhibits bright exciton emission and enhance X-ray attenuation through the incorporation of lead halide. Remarkably, the addition of lead halide does not compromise the glass's high transparency, which remains ≈90% in the 400–800 nm wavelength range. Transient absorption measurements further reveal that the presence of heavy atoms enhances intersystem crossing and improves triplet emission efficiency, increasing the photoluminescence quantum yield from 7.1% in pure ETPCl glass to 35.4% in glass containing 10 mol.% PbCl₂. Additionally, the heavy atom effect enhances X-ray attenuation, leading to increased radioluminescence intensity. X-ray imaging experiments demonstrate a spatial resolution of up to 19.9 lp mm⁻¹ at a modulation transfer function value of 0.2. These findings provide a promising approach for fabricating transparent organic scintillator glasses with improved triplet exciton utilization and X-ray attenuation, enabling high-resolution X-ray imaging. © 2025 Wiley-VCH GmbH.

关键词： heavy atom effect imaging scintillator spatial resolution triplet emission

Revealing the Microscopic Mechanism of Elementary Vortex Pinning in Superconductors

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Physical Review X 2024年第4期14卷 041039页

作者： C. Chen Y. Liu Y. Chen Y. N. Hu T. Z. Zhang D. Li X. Wang C. X. Wang Z. Y. W. Lu Y. H. Zhang Q. L. Zhang X. L. Dong R. Wang D. L. Feng T. Zhang Department of Physics State Key Laboratory of Surface Physics and Advanced Material Laboratory Zhejiang Institute of Photoelectronics and Zhejiang Institute for Advanced Light Source Beijing National Laboratory for Condensed Matter Physics School of Physical Sciences National Laboratory of Solid State Microstructures and Department of Physics Interdisciplinary Materials Research Center School of Materials Science and Engineering Dongguan Guangdong 523808 China Nanjing 210093 China Jiangsu Physical Science Research Center Nanjing 210093 China New Cornerstone Laboratory National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology Hefei National Laboratory Hefei 230088 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

Vortex pinning is a crucial factor that determines the critical current of practical superconductors and enables their diverse applications. However, the underlying mechanism of vortex pinning has long been elusive, lacking a clear microscopic explanation. Here, using high-resolution scanning tunneling microscopy, we studied single vortex pinning induced by point defect in layered FeSe-based superconductors. We found the defect-vortex interaction drives low-energy vortex bound states away from EF, creating a “mini” gap that effectively lowers the system energy and enhances pinning. By measuring the local density of states, we directly obtained the elementary pinning energy and estimated the pinning force via the spatial gradient of pinning energy. The results are consistent with bulk critical current measurement. Furthermore, we showed that a general microscopic quantum model incorporating defect-vortex interaction can naturally capture our observation. It suggests that the local pairing near pinned vortex core is actually enhanced compared to unpinned vortex, which is beyond the traditional understanding that nonsuperconducting regions pin vortices. Our study thus unveils a general microscopic mechanism of vortex pinning in superconductors and provides insights for enhancing the critical current of practical superconductors.

关键词： Vortices in superconductors BCS theory Bogoliubov-de Gennes equations Scanning tunneling microscopy Scanning tunneling spectroscopy Transport techniques

Uniformly Dispersed Carbide Reinforcements in the Medium-Entropy High-Speed Steel Coatings by Wide-Band Laser Cladding

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1145-1150页

作者： Bang Dou Hui Zhang Jia-Hao Zhu Ben-Qi Xu Zi-Yi Zhou Ji-Li Wu Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMa'anshan 243002China School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

A medium-entropy high-speed steel(ME-HSS)coating with the 76 at.%of Fe and multiple alloying elements was prepared by the wide-band laser *** with the commercial W6 Mo5 Cr4 V2(M2)HSS coating which contains a large number of network lamellar M2 C-type carbides along the grain boundaries,the presented ME-HSS coating has a high quantity of fi ner and more uniformly dispersed M C-type carbides;on the other hand,the coating has less retained austenite and much lower brittleness as well as similar secondary hardening eff ect and tempering hardness.

关键词： High-speed steel Medium-entropy alloy Phase selection Laser cladding

Synthesis of High-Specific-Capacity Prussian Blue Analogues for Sodium-Ion Batteries Boosted by Grooved Structure

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SSRN 2023年

作者： Han, Jiajia Hu, Ya'nan Han, Qinghao Liu, Xingjun Wang, Cuiping Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials Xiamen University Xiamen361005 China Xiamen Key Laboratory of High Performance Metals and Materials Xiamen University Xiamen361005 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Institute of Materials Genome and Big Data Harbin Institute of Technology Shenzhen518055 China

In view of the problems of low specific capacity and poor cycle performance of Prussian blue analogues as cathode materials of sodium-ion battery, this work made surface etching modification on the synthesized Fe0.8Co0.2HCF with regular cube structure and optimized electrochemical performance. With the help of the resulting grooved structure, the electrode material has been further significantly improved. The results show that the etched sample has a discharge capacity of 153.3 mAh/g at 0.5 C and maintains 83.3 % after 200 cycles at 2 C. When the rate returns from 16 C to 0.5 C, the discharge capacity can be maintained at about 90.7 %. Combined with experimental analysis and theoretical calculation, the improved electrochemical performance of etching sample is mainly attributed to the following three aspects: (1) fast diffusivity of Na+;(2) reduced water content;(3) large contact area between electrode and electrolyte. © 2023, The Authors. All rights reserved.

关键词： Sodium-ion batteries

Near-room-temperature ferromagnetic 1T Nb1−xCrxTe2 from doping-induced phase transition of 1T’ NbTe2

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Science China Materials 2025年 1-9页

作者： Li, Kunqi Zhou, Yuxuan Yang, Ke Han, Yutao Yuan, Yakun Tu, Xueyang Wang, Yiyang Sun, Xuzhou Bi, Hui Fang, Yuqiang Wu, Hua Huang, Fuqiang The State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China Laboratory for Computational Physical Sciences (MOE) State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai China College of Science University of Shanghai for Science and Technology Shanghai China State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Zhangjiang Institute for Advanced Study Shanghai Jiao Tong University Shanghai China Shanghai Qi Zhi Institute Shanghai China Hefei National Laboratory Hefei China

Magnetic transition metal dichalcogenides exhibit unique spintronic properties, making them highly promising for advanced spintronic devices. It is unpreparable 1T NbTe2, rather than the stable 1T’ phase, that has been theoretically predicted to host nontrivial topology, but its thermodynamic structural instability hinders its development in spintronic applications. Heteroatom doping is effective in not only stabilizing the 1T phase but also introducing magnetism. Herein, we synthesized a series of Nb1−xCrxTe2 (x = 0, 0.1, 0.2, 1/3, 0.4) crystals and discovered the 1T Nb2/3Cr1/3Te2 phase for the first time. Observed 1T’-to-1T structural transition occurs in NbTe2 due to the Cr doping. Thermodynamically stable Nb2/3Cr1/3Te2 is confirmed to be a 1T phase from density functional theory calculations. A notable transition from diamagnetic to ferromagnetism was found in Nb1−xCrx-Te2 with the ratio of Cr increasing. The magnetism of 1T Nb2/3Cr1/3Te2 primarily originates from localized Cr 3d electrons. This crystal achieves a Curie temperature of 254 K, surpassing most Cr-based van der Waals ferromagnets. Furthermore, 1T Nb2/3Cr1/3Te2 displays metallic behavior coexisting with the Kondo effect and a robust positive magnetoresistance (32.1% at 2 K, μ0H = 9 T). This work unveils a doping-induced phase transition mechanism and provides new layered ferromagnetic materials for spintronic devices.

关键词：

engineering nanointerface of molybdenum-based heterostructures to boost the electrocatalytic hydrogen evolution reaction

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Journal of Energy Chemistry 2021年第7期30卷 370-376页

作者： Tong Liu Shuqing Zhou Jing Qi Kaiwen Wang Lirong Zheng Qingming Huang Tianhua Zhou Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710000ShaanxiChina Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Testing Center Fuzhou UniversityFuzhou 350116FujianChina

Rational heterostructure-design in electrocatalysts represents a promising approach toward high performance in the electrocatalytic hydrogen evolution reaction(HER).In specific,optimizing the H adsorption behavior at the surface/interface of heterostructure is of key importance to improve the catalytic ***,we demonstrate the construction of a heterostructure from a well-defined oxygenbridged Co/Mo heterometallic zeolitic imidazolate framework(MOZ) as an efficient electrocatalyst for *** optimized hybrid exhibits high catalytic activity and stability in electrolytes with a wide pH *** XPS,XAS and theoretical studies reveal that the regulation of metal species can tailor the lattice of Mo_(2)C within the hybrid and induce the formation of defect sites,which could not only induce surface charge transfer between the atoms and provide an additional active site,but also affect the H adsorption behavior at the interface of a *** work provides an effective strategy to design a heterostructure with tailored active sites for energy conversion.

关键词： Electrocatalysis Metal-organic framework Water splitting Heterostructure

Texture Evolution of Ti3v2hf2.5ta2.5 Refractory Multicomponent Alloys During Cold Rolling and Annealing

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SSRN 2024年

作者： Chen, Mingtao Li, Yuqing Jiang, Wenqing Hou, Yuhan Liu, Xiaolong Zhao, Bokai Gao, Jianbo Wang, Hongliang Li, Meijuan Sun, Kai Chen, Dongfeng Zhang, Zhongwu Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University 145 Nantong Street Harbin150001 China Centre of Excellence for Advanced Materials Dongguan523808 China

In this paper, the texture evolution and formation mechanism of Ti3V2Hf2.5Ta2.5 refractory multicomponent alloy under various processing conditions were systematically studied using neutron diffraction combined with electron backscattering diffraction. After cold rolling with a thickness reduction of 20%, 50% and 85%, respectively, the texture intensity increases continuously with the increase in the thickness reduction. Stable deformation components of a and g fiber orientations {001}, {111}, {111} and {111} are formed in the alloy through the joint mechanism of {112} slip system activation and deformation twins. Meanwhile, the weak texture component of h fiber orientation {001} appears attributing to shear stress. After annealing under different conditions, texture intensity decreases significantly with the increases in annealing time or annealing temperature. Partial deformation texture components are remained, while new texture components such as {113} and {112} appear, as a result of recrystallization and recovery existing simultaneously, selective growth and oriented nucleation mechanisms competing with each other. More over, under the same annealing conditions, sample with larger cold rolling deformation exhibits stronger texture. © 2024, The Authors. All rights reserved.

关键词： Textures